気がつく

notice; realize

→ 気
phrase Rare #33,166
notice; realize Means to become aware of or notice something. In other contexts, it can also mean to wake up.
JA: ふと窓が開いていることに気がつく。
EN: I suddenly notice that the window is open.

気がつくと、そこにありました。

Before I knew it, it was there.

気がつくのが恐ろしいか

Is it terrifying to become aware of it?

— Cosmic Princess Kaguya! (2026)

じきに気がつく

You'll soon notice.

— もののけ姫 (1997)

気がつくと逃げ場はどこにもなかった。

Before I knew it, there was nowhere left to run.

あなたなかなかよいところへ気がつくこと

You really do notice the good things.

— Sanjuro (1962)

妙に明るいんで雲の中だと気がつくまでに―ずいぶん時間がかかったよ

It was oddly bright, so it took me quite a while to realize I was in the clouds.

— 紅の豚 (1992)